Seminarium "Teoria cząstek elementarnych i kosmologia"

In this talk, I will discuss gravitational production of dark matter in the early universe. In particular, I will carefully evaluate the particle production rate from the transition epoch to the inflaton oscillation epoch in a realistic inflation model, and point out that the gravitational production is efficient even if dark matter mass is much larger than the Hubble scale during inflation as long as it is smaller than the inflaton mass. I will first discuss a scalar field case, and then move to a vector field case.